Here comes an unconventional issue of plate chillers and other reverse flow chillers.
Using the reverse chiller without hop spiders or filters, you might get higher than expected IBU.
The wort to be chilled remains at over 200F temperature, so if the hops is not removed, isomerization will keep going.
If you can chill the whole wort in 5 to 10 minutes, the additional IBU should be minor.
For bitter hops, I bet you can't feel the difference. However, if high alpha hops, like citra or mosaic, is used as aroma hops, you might need to consider the extra time.
Another issue of plate chiller that Gordon Strong mentions in his book is that the cold break will go into your fermenter if the chilled wort goes directly to your fermenter.
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